Loose, corroded or damaged connector or wiring at the charger input voltage sensor circuit; Poor connection or wear in the charge inlet socket or charge cable contacts; Unstable or poor-quality external supply, such as a faulty home socket, extension lead or charging point; Internal fault in the on-board charger's input voltage sensing; Water ingress or heat damage in the charger harness or its connectors; Outdated control unit software on the charger or hybrid control module, where the manufacturer has issued a fix.

P0D41

Battery Charger A Input Voltage Sensor A Circuit Intermittent/Erratic.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
D: AreaReserved
41: FaultThe specific fault in that area

What it means

P0D41 is a generic powertrain code meaning the control unit has detected an intermittent or erratic signal from the input voltage sensor of battery charger A. This sensor measures the mains or external supply voltage going into the on-board charger of a plug-in hybrid or electric vehicle. The module saw the reading jump, drop out or change implausibly rather than staying steady, so it set the fault.

Symptoms

Charging starts and stops or fails to complete
Charging works on some chargers or sockets but not others
Charge port or charging warning light on the dashboard
Reduced charging rate or charge time much longer than normal
Malfunction indicator lamp or hybrid system warning on
Fault appears and clears at random

Possible causes

Loose, corroded or damaged connector or wiring at the charger input voltage sensor circuitlikely
Poor connection or wear in the charge inlet socket or charge cable contactslikely
Unstable or poor-quality external supply, such as a faulty home socket, extension lead or charging pointpossible
Internal fault in the on-board charger's input voltage sensingpossible
Water ingress or heat damage in the charger harness or its connectorspossible
Outdated control unit software on the charger or hybrid control module, where the manufacturer has issued a fixrare

How to diagnose

Read all stored codes and freeze frame data, noting whether the fault occurs during charging and under what conditions
Ask when it happens: which charging point, cable and socket, and whether it also happens elsewhere
Try a different known-good charging point and cable to rule out the external supply
Inspect the charge inlet for dirt, corrosion, bent pins, heat marks and moisture
Inspect the charger harness and connectors for chafing, corrosion, loose pins and water ingress, flexing the wiring while monitoring live data for dropouts
Watch the charger input voltage live data during charging and check it is steady and plausible against the actual supply voltage
Check the wiring for continuity, resistance and shorts using the manufacturer's wiring diagram, following high-voltage safety procedures
Check for software updates or technical bulletins for the specific model, as procedures vary by manufacturer

How to fix

Clean, repair or replace faulty connectors and damaged wiring in the charger input circuit
Replace a worn or damaged charge inlet socket or charging cable
Have the home supply or charging point inspected and repaired by a qualified electrician
Replace the on-board charger if its internal voltage sensing is proven faulty
Dry out and seal or replace any water-damaged harness sections
Apply a manufacturer software update if an outdated calibration is a known cause for that model

Can I keep driving?

Medium severity

The car can usually still be driven, as this fault mainly affects charging, though on a plug-in hybrid it may run on the engine alone. Get it checked soon, as charging may become unreliable and high-voltage electrical faults can worsen, and only a suitably trained technician should work on high-voltage components.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.